The company earned a revenue of PhP75,500 at the end of the fourth year but then decreases geometrically by 18% per year through year 20. Assume that the company invested PhP100,000 before the start of the business.

a) Determine the present worth equivalent of all revenues during this 20-year time period at an interest rate of 12% per annum. Answer in 2 decimal places.

b) What will be the future equivalent of all revenues during this 20-year time period? Answer in 2 decimal places.

c) What is the annual worth equivalent of these revenues during the 20-year time period? Answer in 2 decimal places.

d) What is the internal rate of return (in percentage) of this investment? Answer in 2 decimal places.